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Three British soldiers, wearing chemical and biological protective gear, sit in front of portraits of members of the Saudi royal family in a hotel lobby while waiting for the all-clear siren during a Scud missile alert in Dhahran, Saudi Arabia, during the Persian Gulf War in this February 26, 1991 photo. After initially saying its troops escaped exposure to poison  gas, Britain says trace amounts of the chemicals reached its soldiers when  the U.S. military destroyed an Iraqi weapons dump. (APPhoto/J. Scott Applewhite) J. Scott Applewhite/AP